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Photo#473126
Posterior view of chelicerae (BG:394474) - Wadotes - Wadotes

Posterior view of chelicerae (BG:394474) - Wadotes - Wadotes
Groton, Middlesex County, Massachusetts, USA
Keying out the Amaurobidae, lack of a cribellum and two teeth on the retromargin of the chelicerae (arrow) leads to the genus Wadotes; three or more teeth would be Coras*. Those are the outer mouth parts (endites and labium) visible near the upper-left margin of the image.

Habitus image (by Tom Murray) here:


* Those were the criteria established in 1925 by R. V. Chamberlin, when he studied the ecribellate North American species previously placed in Coelotes and split them into two new genera: Wadotes Chamberlin, 1925 and Coras Chamberlin, 1925.